In the recent years, there has been an increasing demand for effective ethanol sensor in the pharmaceutical and food industries where there is a need to constantly monitor and maintain the permissible level of ethanol. In this study, we report the development of a fiber optic sensor based on Lossy Mode Resonance (LMR) technique using tin oxide (SnO₂) thin film over the unclad core of the optical fiber as the sensing layer for measuring the ethanol concentration in an aqueous solution. Two sensor probes (SP1 and SP2) comprised of 600 μm core with 120 nm SnO₂ layer (SP1) and 400 μm core with 250 nm SnO₂ layer (SP2) were selected for measurement of ethanol concentration in the range of 0–100 vol% after optimizing eight sensor probes coated with SnO₂ layers of different thicknesses. The ethanol sensing performance was characterized by a shift in the peak LMR wavelength for varying concentrations of ethanol. The sensor probe SP2 exhibits better sensitivity of 3.40 nm/vol% with a maximum sensor response of 13.3% for an ethanol concentration of 80%. The sensor probes exhibit good repeatability with a deviation of 0.26% and 0.12% for probes SP1 and SP2, respectively.

近年来，制药和食品行业对有效乙醇传感器的需求不断增加，需要不断监测和保持乙醇的允许水平。在这项研究中，我们报告了基于损耗模式共振 (LMR) 技术的光纤传感器的开发，该技术使用光纤裸芯上的氧化锡 (SnO ₂ ) 薄膜作为传感层，用于测量光纤中的乙醇浓度。水溶液。两个传感器探针（SP1 和 SP2）由 600 μm 核心和 120 nm SnO ₂层（SP1）和 400 μm 核心和 250 nm SnO ₂层（SP2）组成，用于测量 0–100 vol 范围内的乙醇浓度优化八个涂有 SnO _{2 的}传感器探头后的百分比不同厚度的层。乙醇传感性能的特征在于不同浓度乙醇的峰值 LMR 波长的偏移。传感器探针 SP2 表现出更好的灵敏度，为 3.40 nm/vol%，对于 80% 的乙醇浓度，最大传感器响应为 13.3%。传感器探头表现出良好的重复性，探头 SP1 和 SP2 的偏差分别为 0.26% 和 0.12%。